Workshop 5.1 - Goals
Our goal is to investigate the vibration characteristics of a motor cover manufactured from 18 gage steel. The cover is to be fastened to a device operating at 1000 Hz.
Workshop 5.1 - Assumptions
-The cover is meant to slip over a cylinder and be constrained at the bolt hole locations. To simulate the area contacting the cylinder the surface has been split (see below). We will use a frictionless support on this surface to simulate the contact area. The frictionless support type applies a constraint that is normal to the surface, thus axial and tangential movement is allowed while radial motion is not.
-To simulate the bolted connections a fixed support type will be used on the edges of the bolt holes.
Workshop 5.1–Project Schematic
Open the Project page.
From the “Units” menu verify:
-Project units are set to “US Customary (lbm, in, s, F, A, lbf, V).
-“Display Values in Project Units” is checked (on).
1.From the Toolbox double click “Modal” to create a new system.
2.RMB the “Geometry” cell and browse to “Motor_cover_5.x_t”.
3.Double click “Model” to open the Mechanical application.
Workshop 5.1 - Setup
4.Set the working Unit System:
-Units > U.S Customary (in, lbm, lbf, °F, s, V, A)
5.Rename the Model:
-RMB Model branch > Rename > “5 Hole Cover”.
Workshop 5.1 - Preprocessing
Since the model consists of surface geometry the parts will be meshed with shell elements. Surface geometry requires input for thickness in the details.
6.Specify Part thickness:
a.Highlight the “Part 1” branch.
Note : The “Thickness” field is currently displayed in yellow to indicate it is undefined. Also, the Part has a question mark next to it which means that it is not fully defined
http://www.cadfamily.com/html/Article/Free%20Vibration%20Analysis_685_1.htm
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